As per the TSM redbook at:

http://www.redbooks.ibm.com/redbooks/pdfs/sg245416.pdf

It suggests use of DISKDIRS and OFFDIRS to store directory information
to avoid restore-time directory reconstruction hits.

Everything makes sense, including the need to explicitly bind all
directories on a client to the DISKDIRS management class with DIRMC.

The next question is... *how* do you select ONLY directories for this
management class without selecting any files within them, in dsm.opt?

(Server is 5.1.8.0 on AIX and clients are 5.1.5.14/15 on Windows, Linux,
Solaris, and AIX.)

I had also checked the TSM 5.1.5 UNIX client reference from:

http://publib.boulder.ibm.com/tividd/td/TSMC/GC32-0789-02/en_US/PDF/GC32-0789-02.pdf

...and read through everything referencing include, exclude, dirmc, but
it's still not obvious to me how to select only directory data for use
with DIRMC DISKDIRS. I see there's a dirsonly keyword, but how to use it
within context of dsm.opt?

        include / -dirsonly -dirmc diskdirs

?

-Dan